An airtight container having a lid with negligible mass and an area of 8 cm² is partially evacuated. If a 48N force is required to pull the lid off the container and the atmospheric pressure is 10⁵ Pa, the pressure in the container before it is opened must be __
(A) 0.6 atm
(B) 0.5 atm
(C) 0.4 atm
(D) 0.2 atm
